Quick-detachable dust-cap



G. WQSCOTT.

QU-ICK DETACHABLE DUST GAP.

APPLICATION FILED MAR-18.1920- Patented Dec. 6; 1921. 7

v INVENTOR GEORGE W. sco-rr UNITED STATEF;

GEORGE W. SCOTT, OE SANTA ROSA, CALIFORNIA. v

QUIJK-DETACEIABLE DD'ST-CAIP.

Application filed March 18, 1820.

04 concern Q I S orten it. Soorr. a

cltates. and a resident county of So.- ave made a new Improvements 1 do "ularly to oust caps of the quick detachable type for the valve stems at automobile tire tubes.

in object of my invention is to provide tubular inclosing member that will completely surround the projecting valve stem and by the new no el con etion em bodied herein permit the cap to be quickly attached or de ached to the stem by a sim ple turn or axial rotation relative to the stern, eliminating the, necessity for internally threading the caps and screwing the onto the stem, as is the present practice. 25 A further object is to provide a dustcap without external projections or depressions and which will generally be free from objectional and dangerous elements of construction.

In this specification and the annexed drawings, the invention is illust ated n the form considered to be the best, but it is to be understood that the invention is not limited to such form, because it may be enibodied in other forms; and it is also to be understood that in and by the claims following the description it is desired to cover the invention in whatsoever form it may be embodied.

In the following one sheet 01" drawings- Figure 1 represents a sectional view take through the telly of wheel with my inven tion applied to'the projecting stem of the tube valve.

Fig. 2 a sectional view Fig. 1 on the line IIII.

Fig. 3 is an enlarged sectional view. partly in side elevation of a valve stem and nut constructed in accordance with my invention.

In detail the construction illustrated in the drawings includes the telly i of a wheel of an automobile having the threaded stem 2 of the tire tube passing therethrough. The stem according to standard methods of construction is provided with a loci: nut

This invention relates taken through Specification of Letters Patent.

Patented Dec. 6, 1921. Serial No. 866,776.

adjacent the metallic saddle 4: which is lamped rigidly against the. wall of the inner tube and by reason of the factthat this application in not concerned with the particular structure of the connection between tube and stem the same is only mentioned in so far as to call attention to the possibilities of adapting my improvement to standard tube stems. .As in usual practic-e the stem 2 is firmly positioned on the telly by the hollow lock nut 5, screwed thereon and frictionallyengaging the telly. The nut 5 may be either shaped hexagonally for wrench engagement, and is further provided with the integral, annular projection or shoulder 7 on its outer face. Adjacent the projection 7 and within the body portion 5, the nut is milled or routed out to form an annular recess or depressionS, into which isadapted to be member or compression coil spring 9 and the annular washer 10, the purpose of which will be hereinafter described in detail. The recess 8 has the projections or einbossments ll struck out from its outer upper edge for engaging the washer and thus retaining the spring within the recess. V

The shoulder portion 7 of the nut 5. is provided with one or a plurality of angularly disposed depressions 12, periphery which may be arranged at any desired position or angle. In the present in stance the grooves 12 are L shaped, but it would be clearly within the purview of the invention'to modify the depression to any form best calculated to rigidly hold the dust cap 1d thereon. The partially closed tubu lar inclosing member 1% if ovided with an open flared end having the shoulder beading l5 therearound, contiguous to which one or a plurality of inwardly projecting arms 16 are secured and which are adaptec to enter companion angularly disposed grooves By means of a quarter turn or twist, axial rotation will be imparted to the cap, sufiicient to place the projections within the grooves and to hold the cap firmly on the nut. In Fig. 3 it will be seer? that when the cap is in the locked position on the stem the shoulder 15 will bear against the washer 10 to compress the resilient spring 9, which action serves to frictionally deter the cap from free rotation.

The cust cap is applied to the nut on the l placing the same thereplaced the resilient around its formed within the cap, register with the a companion grooves 12. On pressing the ed t pe of dust cap.

be rigidly positioned.

pneumatic same down the annular shoulder 15 on the cap, thereupon engages the washer 10 upheld by the coil spring 9, the tension of which must be overcome By pressing down on the cap and compressing the spring 9, the pins 16 will be brought into register with the lower recess of the grooves 12 where the cap will be held from further rotation bythe frictional contact of the outwardly ex anding spring. To remove the cap it is on y necessary to press inward against the tension of the spring and to rotatethe cap until its inner projections register with the vertical rooves of the L shaped depressions.

The ust cap thus described can be quickly attachedzor detached from the stern of the tube and overcomes many apparent disadvantages inherent in the usual threadaving thus described niy invention, what I claim and desire to secure by Letters Patent is 1. A device such as described comprising in combinatlon the threaded valve stem of a tire; a nut in threaded engage ment with said stem having an exterior portion adapted for wrench engagement; a concentric shoulder projecting from said nut; angular depressions formed in the projectin shoulder and spaced from the face of sald nut; an annular depression in said nut surrounding the base of said shoulder; inwardly extended projections formed Within said annular depression; a washer within said depression and a spring confined within said depression between the base thereof and said washer, and a valve cap having internal projections therein adapted to inclose said stem and engage the angular depressions in said projecting shoulder whereby 4 before the cap can the spring pressed washer,

the end of said cap will tensioned washer in the depression to fixedly hold the capin position on the nut;

2. A device of the kind described comprising a nut adapted for threaded engagement with a valve stem and having an eX- terior portion shaped for engagement by a wrench, asleeve projecting from said nut, bayonet slots formed in said sleeve and spaced from the face of the nut, a spring surrounding said sleeve, a washer riding on said spring the nut being formed with portions to riches said spring and interned at the top to retain said washer, a cap adapted to fit said sleeve and inclose the valve stern said cap having internal projections to en gage the bayonet lower edge or the cap to engage and'depress whereby when the cap is partially rotated the coaction 'be-' tween the bayonet slots on the sleeve the projections on the cap and the tension of the spring will hold the cap in position.

8. In combinationxwith a surrounding said stern and having a plurality of bayonet slots, a washer yieldably mounted uponsaid sleeve, a tubular casing concentrically disposed in spaced relation to said sleeve ant limit themovernent or: said washer under engage the spring slots and to permit the stem, of a sleeve L formed to provide means to the influence of said yieldable means in one have hereunto set California, this 7 e enonen w. sco'r'r.

In presence oi- 7 JAMES E. Scorr,

LINCOLN V. JoHNsoN. 

